摘要
利用Penman-Monteith公式计算了甘肃张掖绿洲主要作物各生育期参考作物蒸散量,利用农田水量平衡方程及土壤水分胁迫系数计算了作物实际蒸发蒸腾量,并计算比较了充分灌溉和非充分灌溉条件下不同生育期作物需水特征,确定了非充分灌溉条件下主要作物的作物系数。结果表明,非充分灌溉条件下,主要作物各生育期需水规律和充分灌溉具有一致变化趋势。非充分灌溉条件下,小麦、玉米、马铃薯全生育期作物系数平均值分别为0.81、0.7和0.73。在全生育期当中,随生育期的延续,主要作物叶面蒸腾比例逐渐增大,棵间蒸发逐渐减少。
According to the data of the field tests conducted from 2006 to 2009 in Hexi oasis irrigation region,reference crop evaporations of the main crops（spring wheat,maize,potato） in different stages were gained based on the equation of Penman-Monteith formula and the evapotranspiration was determined by water balance equation and soil water stress coefficient formula.From these methods,crops water requirement and crops coefficient under insufficient irrigation were determined.The results showed that： the rule of crop water requirement of the main crops in different stages was the same trend under insufficient irrigation and sufficient irrigation.The average crop coefficients of spring wheat,maize and potato were respectively 0.81,0.7,and 0.73 in the whole growth period under insufficient irrigation.With the continued growth,the ratio of leaf transpiration was gradually increasing and soil evaporation was gradually decreasing.The ratios of soil evaporation to evapotranspiration of wheat,maize and potato were respectively 37%,39%,45%,and the ratios of leaf transpiration of wheat,maize and potato were respectively 63%,61%,55%.
出处
《灌溉排水学报》
CSCD
北大核心
2012年第5期136-139,共4页
Journal of Irrigation and Drainage
基金
农业部948项目(2006-G52)
关键词
作物需水量
作物系数
非充分灌溉
河西绿洲灌区
crops water requirement
crop coefficient
Insufficient Irrigation
in Oasis Irrigation Region
